Recall control means



Patented Sept. 14, 1948 UNITED STATES n eNr orties Edgewood, Pa., assigner-s to'lilhe Union Switch` s Signal` Company, Swissvaie, Pa., avv corpora-4 tion oflPennsylvania Application September 18, ltll, Serial No. 691370.@

(ci. ivre-35,3)

i9 Claims.` i

Our invention relates to,V remote control` systems for the. control' from a central ofce of selected devices located` at remote stations,l and for alsoindicating at the oice the condition of such devices: andV of" other devices. located at the stations. More particularly, our invention. ref. lates to centralized traiic control systems for railroads in which traffic governing devices distributed along a stretch, of track are controlled from time toltime by` means ofl impulse codes transmitted: over` a line lcircuit and in which the same line circuit is used at other times to indicate the`V positions ofV the traflic governing devices and toi. indicate the presence and movement of' trains through theV stretch.

Our invention is an improvement upon vthat disclosed in Letters Patent of the UnitedStates No. 2,396,812, granted March 19, 1946, toGeorge W. Baughman, for Remote control systems.

In systemsof this character it is the practice to provide codingunits at the office and at the several stations which are arranged to deliver codes to the-aline circuit connecting the office and the eld station-s; It is also the practice to. employy composite codesin which the code elements are arranged in two groups, those of the lirst groupbeing`v arranged in a distinctive pattern toprovide a code. ycall identifying the selected location, andv those ofthe second group providing means for controlling a plurality of devices in the same code. More particularly, ineach` control code` transmittedfrom the oice, the first gronpofl elements operates a selector relay at the selected station, while a selector relayat the olii-'ce oper-ated at the same time places the coding unit under the control of a group of levers containedinan individual panel for thatstation which govern the character ofthe second group ofelements in the code to control a group' of trarne governing devices at the selected station.

In an` indication code vthe selector relay by which the oftice coding unitA is associated with the. control panelfor the transmitting station is operatedbythe rst group of elements'to render the secondigronpof `elements ofthe code effective to cont-rol a pluralityI of indication lamps mounted on that panel tor indicate` the condition of each o-i a plurality otm-ov-able devices at; that station.` Y

Such indication codes are initiated` automaticallyflnresponse to a change` in conditionjof; any one` oi` -thefrnovable devices.-` For exannole,f the system may be arranged to` initiate a code in response to the Icase Of 2t tract;Y relay by a train passing the station, ores, fa` result,v of a` i' change in the position of a track switch, op in-l the conditioner` the signals which governtrac movements over the Swithdue to. the reeertqn Gfa control4 code from the omce,

It; is-l sometimes desirable to Verity, the condel l tion `of the stationgdeviceswithout changingtl'leirP condition, particularly after the` system .hasfbeea idlefor` a while.V

In the, System: shown the abovefdentief patentto George'W. Bauglinian; therey is` sho an improvedallI-angement loy;` whichthe operatormay effect the, initiation (1f-indication codes; bythe codingunits at; one on more selectedgstations without transmitting control;` elements o fitlie seca ced group, In tire svstemfothe. patent-t0 George W. Baughman a. special recall button is provided, which, if operated along with the individ 4al starting button by4 means :of whicnthe, codecall is selected; and thev codeL initiated, causes, the transmission of a special recall code` containing only the first group of elements constitutingzthe stationcode call, while the stationv apparatus is c orrespondingly modiiiedso that an indication code will he initiated in response to the `operation of the station selec-torrelayA provided the` code is terminated on the step followingv the group constituting-the station code call. f

The system shown in the patent to George-W. Baughma'n is adapted for use withla codecommunication system ofj the type shown in Letters Patent of the United States No. 2,329,21i9granted, January` 2 1, 1941 tollloyd V; Lewis. The system of` the patent. to Lloyd V, Lewis is arranged soptransmision of a control code.` tc a nel@ station is ,initiated lov.` enereizaton of` a startingA relay atthe, cince for the panel asso: ciatedwithvthe stationto which the` code is` to be sent. Each starting. relay, Whenenereized. remains., energized. until. the corresponding station is selected, as evidenced by energization ci the associated selector relay.V In this wav control codesmav be stored. fortransmssion to herofv stations.H

As.1A explained in detail inthepatent to` Lloyd V. Lewis, when a plurality of `starting relaysl are picked each` startingA relay will cause the transmission of aA control code to the corresponding station, and thesev codes will be Ytransmitted in sequence in a predetermined order governed by the elements of the rst group of elementsE of the control code.` TheY operationof the. system of the Lewispatent is such that the varioussta tions arearrangedV inla, predetermined order of preference insofar` as, transmission ofcontrol codes is concerned. Each starting relay when energized will cause transmission of a control code to the associated station before control codes are sent to stations inferior to it in the order of preference even though the starting relays for the inferior stations were energized rst. Similarly, a starting relay when energized will not cause a control code to be transmitted to the associated iield station until all of the starting relays for superior stations are released even though the starting relays for some of the superior stations are not energized until after the starting relay for the station under consideration was energized. The operation of the system of the patent to Lloyd V. Lewis is such, therefore, that when a starting button is pressed to energize the starting relay for a panel to cause a control code to be sent to the corresponding station, the control code may not be sent until after control codes are sent to one or more other stations.

. The recall relay RCR provided by the patent to George W. Baughman governs the operation of the oiiice coding unit in such manner that when the relay is picked up the first eight or station selection steps of a con-trol code are transmitted in the normal manner and operate the eld station units to select the desired station. When relay RCR is picked up, the ninth step of the control code is made abnormally long with the result that the relay RCR is released and the oilice coding unit is restored to nomral. The extra long ninth step in the control code will not operate the function control relays at the selected station but will operate the starting relay at that field station to cause an indication code to be transmitted to the oice.

An object of this invention is to provide improved means for controlling the recall control relay RCR of the patent to George W. Baughman so as to insure that When the operator attempts to send a recall code t-o a selected station, the recall code will be sent to the designated station.

A further object of the invention is to provide improved means of the type described which is arranged so that attempted transmission of a recall code to a selected station will not interfere with the Itransmission of control codes which are awaiting transmission to other stations.

Another` object of the invention is to provide improved means of the type described which is arranged so that transmission of a recall code to a selected station will not result in undesired transmission of control codes to other stations.

A further object of the invention is to provide improved means of the type described which is arranged so lthat when the operator attempts to send a recall code to a selected station, the code subsequently transmitted to this station is certain t-o be a recall code and will not be a normal control code.

Another object of the invention is to provide improved means of the vtype described which is iarranged so that when the operator actuates the starting push buttons to send a recall code to one station and to send control codes to other stations, the equipment is certain to be conditioned to transmit a recall code to the designated station regardless of the condition of the ofIi-ce coding unit at the time that these push buttons are actuated.

sponse to this recall code will be transmitted with a minimum of delay.

Another object of the invention is to provide improved means of the type described which causes a recall code to take precedence over all other control codes regardless of the relative superiority of the stations to which the recall and control codes are to be transmitted.

A further object of the invention is to provide improved means of the type described which opcrates so that after a recall code is initiated all control codes are deferred until the indication is received in response to the recall code to thereby reduce the delay in the recall indication code by the time which would be required to transmit the stored control codes'and by the time required to transmit indie-ations from at least some of the stations for which these stored control codes are intended. Y

Another object of the invention is to provide improved means of 4the type described which will not operate to send a recall code if, at the time a starting button is actuated to initiate the recall code, an indication code is being received from the station t-o which the recall code is to be sent.

A further object of the invention is to provide improved means of the type described which operates in such manner Ithat if any code is initiated as a result'of an attempt to send a recall code it will be a recall code and will not be a control code.

Another object of the invention is to provide improved means of the type described which is arranged so that the recall control means may be applied to all stations or only to selected stations as desired.

A further object of the invention is to provide improved recall code control means which isarranged so that when a starting button is operated to initiate a recall code to the corresponding station, lthe starting button is ineffective to control the circuits which it govern-s for actuating the' starting .relays for other stations to lthereby prevent unintended transmission of control codes to such other stations. Y

Other objects of the invention and i'eaturesof novelty will be apparent from the following description taken in connection with the accompanying drawings.

We shall describe two forms of remote control systems embodying our invention and shall then point out the novel features thereof in claims.

In practicing our invention we provide for each station an auxiliary relay which is energized or actuated along with the associated starting relay when the operator wishes to transmit a recall code to the corresponding station. When. an auxiliary relay is actuated or energized and the office code transmitter transmits a code including the station selection steps designating the station with which the auxiliary relay is associated, a circuit is'established to pick up the recall control relay to thereby cause the ninth step of the code to be abnormally long, after which operation of the code transmitter is discontinued and the recall control relay is released. Since the recall control relay is picked up only when a code is transmitted to the station to which the operator intended the recall code to be trans-` mitted, initiation of a recall code to one station will not cause control codes intended for other stations to be converted to recall codes.

In the modification shown in Fig. 1 each auxiliary relay is released immediately after the recaili code is transmitted tothe'. associated. stai-- tion, whilefin.` the `modification showninFigrZ.

each -auxiliaryrelay is maintained fenergizedluntil an indication code is received from: the, correasponding station.

The modification shown inFig. 211s also arto-other stations. This insures prompt transmission cf`recall`fco'des and promptreceipt of indicationcodes from the` recalled stations.

The'modications shown inbothFigs. 1 and 2 are arranged so that thev starting buttons are operated-in one-manner toY initiate a control code, and'inadifferent manner to initiate a'recall code. The starting buttons are'also arranged so that when4 a button is operated in the' mannerto initiate a recall code Yit will not establish circuits governed thereby for operating the starting relays"forstationsy other'than that'with which the starting `button is associated;

In the drawings, Fig. 1 shows a portion' of a suitable' machinelocated at` a control oiiice and including control panels for three i'leld stations located at the ends of passing sidings, as indicated by the' miniature track diagramiat the top ofthe View, .and

Fig. 2isa diagram' of a modified arrangement which wemay employ.

Similar reference characters refer to' similar elements" in each of 'the two. views.

Referring to. Fig.' 1 of the drawings there is shown in the upper portion of this figure a diagram of. a stretch of. railway including a passing siding together with a single track stretchconnecting this passing siding with another passing siding, while the lower portion of this gure. shows a portion of the circuits Within the control. machine andincorporating. this invention.

Consideration of the detailed mode of operation of. the. code communication system or oi the oontrol. by it of the wayside signaling system is not needed for. an understanding .of our invention and it is deemed.sufficient.to.point.v out that. a fleldstation.. is provided. at each Yend of each passing/.siding and that coding units areprovided at: the. office andY at. each field station and are Eil-65 at lthe o'ce', anda similar relay, notshown,

at one station only is energized. to eect temporary establishment of seven communication cliannelsbetween the ofce and the station. The different stations have diierentcodecalls,.consequently, theselector relays for different stations or. panels are not energized at the same time, and the same. channels provide communication at different times with all ci the stations.

The signal levers ESIG, 4SIG and BSIG on the panel oflthecontrol machine are the usual threeposition levers for the control ofthe signal confio trolll relays:- atn the;V ield stationsI at the; opposite. ends ofithe:stretchlfr Similarly; the:l switch levers; 3W?andSWLaretheusualrtwoeposition.levers: forfthefcontroifioi the switch control .relays at the:

corresponding-nitidi' stations-` The means by which the: switch and. signal. leversV control the switches and signals isfnot;` essential for an.under= standing ofttiis =invention andi has been i omitted in Order to"simplifyithisfdisclosure;

Each# panel" is fprovidedf with` :ai starting `button STBS. forn operating Ythel -usualcode Ystarting relay ST icyy me'ansof"v4 which` control `codes 'aref initiated. and the corresponding stations selected. Eachv starting relay, when energized, initiatesia control' 1 code'lasV described? inA` Lewis Patentf No.. 2,229,249

including a. code: call" for" energizingf a selector relay S furthesamefr panel. Each-selector relay when energized releasesy the associated. starting relay andi connects terminal B' of a local source of energyt'o selected'lones fof ithe control "channels in accordancewthfthe positions of the switchand signal levers, and at the selected station relays are operated'inrv accordance Withthe condition of energizationofeach of the control'channels.

As shown-in tlie= drawings the starting buttons STK are ofthe push-pull type and each has movable contactswhich are --biased to` an inter#- mediateposition; the@ startingv button is pressed-lf the movableV contactsin one set of circuits areclosed', and' when the` starting button is pulled the movablel contactsfina-diilerent set ofcircuitsare closed.`

addition totheusualistarting relay ST,` each panel-'is provided with-anauxiliary-starting relay REST-"which is energized or actuatedwlien the operator initiates transmission of a recall code tov the' station governed through-theV panel' with which the auxiliary relay sfassociated;` TherelaysRCST operate-as hereinafter explained to govern therecall control relay RCR, While the reiay RCR; whenHenerg-i'zed?, operates as explained in the# above-identied patent to George W. Baughman' to cause' the-*codec transmitted by the oice coding unit'tobe'a recallcodeinsteadof a f normal'fcontrol code.

The operation' oftheoi'ce coding'unit in transmitting'avcoderis` governed by the countingrelays Gf-Oi while aback' contacter` the relayRCR is included in the circuit of these counting relays. As explained inv detailin thepatent' to George W; Baughman, When-relay--RCRispicked upthe countingrelays operateto-cause theoflice coding unittov transmit theiirst'eightor'st'ation selection steps of Va code in the normal manner, but the ninth step/in the4 code` is made unusually long, afterwfhirch the relay'RCR releases and the cnice coding unit is restored to normal.

A detailed descriptionv oil the mannerin which the relay'RCR effects this.. control ofi the ofce codingunit, and the. eiectof the recall code on the eldi. station. units isnot necessary for an understandi-ng..` o'f'thisinvention andis fully explainedin the patent to GeorgeA W.' Baughman. In order. to simplify;V this disclosure and.V to re strict it to.. theV structure. provided by this invention', the construction oftheoiiiceV andv eld stationcoding] units, except' for the counting relays of the oiice coding 'unithas not been shown, and it is to be understood that these units. are substantially the same. inY construction. and operation asV the correspondingV units ofthe patent to GeorgeW. Baughman.

As shown in thel drawings each starting button STIB;` when'depressed, establishes a circuit for supplying energy to the associ-ated starting relay,

while contacts ofthe starting button in addi-A tional circuits over which energy maybe supplied to the starting relays for one orboth of the adjoining panels are closed. These additional circuits are governed by relays BKSR so that they may be established only when a rel-ay BKSR is picked up. The'details of the control of the relays BKSR is not a part of this invention and are being omitted in order to simplify this disclosure. These relays may be controlled in the same manner as the corresponding relay of application Serial No. 567,188 led by us on December 8, 1944, now Patent No. 2,411,387, issuedy November 19, 1946. and it is sufficient to stateV that a relay BKKSR is picked up when the ofce'equipment is operated to cause wayside Vapparatus for the track stretch between two ileld stations to change the direction of tramo in that stretch, while the relay BKSR Vreleases, when indications are received from the field stations that the wayside apparatus has established the new direction of traffic.

As'previously stated, the starting buttons areof the push-pull type. Each of these buttons, when pulled, establishes a pick-uprcircuit for an associated auxiliary relay RCST, as well as the associated starting relay ST, while each auxiliary relay RCST, when energized or actuated, operates as hereinafter explained to cause the code transmitted to the associated field station to be a recall code'instead of a control code.

It is to be understood that the contacts governed by pressing a starting button are not closed when the button is pulled, and that the contact governed by pulling th'e button is not closed when the button is pressed. i

The equipment shown in Fig. 1 of the drawings includes relays OM and GLBP which are apart of the cnice coding unit. As explained in the above-identied patents to Lloyd V. Lewis and George W. Baughman the relayfOMis governed so that it is energized when and only when the oiiice coding unit is transmitting a code, while the relay OLBP is governed so as to be picked up as long as the cnice line relay is operated by coded energy. The office line relay is operatedby coded energy during transmission of a code by the ofiice unit and also during receipt of an indication code by this unit.

The pick-up and stick circuits of all of the starting relays ST and all of the auxiliary relays RCST are governed by the cancelling button CB so that all of these relays may be released by pressing the button CB.

The equipment is shown in th'e condition which it assumes when the starting relays ST and the auxiliary relays RCST are released, showing that there are no codes stored for transmission bythe cihce coding unit. In addition, as shown, the relays OM 'and OLBP are released showing that the oiice coding unit is neither transmitting nor receiving a code. Also, as shown, the relays E ABKSR and A EBKSR are released, indicating that the wayside apparatus prepares the main track portion between signals 2R and 4L, and between signals AR and 6L for traiiic in the direction designated by the oiice equipment.

with the equipment in the condition shown the operator wishes to transmit acontrol code to stati-on B ll for any purpose, such as to operate switch 3W, he may initiate this code by pressing the starting button t-lSTB. When thebutton B fiSTB is pressed, its contact Ill establishes a I I establishes the relay stick circuit which is 'gov erned by contact I2 of selector relay 3 4S.

In addition, when starting button 3 4STB is pressed, its contact I4 is closed and energy will be supplied to starting relay I ZST if contact I5 of relay E QBKSR is closed. Similarly, when starting button s dSTB is pressed its contact I Bis closed 'andenergy will be supplied to starting relay E GST if contact Il of relay 4 6BKSR, is closed. As shown in the drawings, the relays 2 4BKSR and Q GBKSR are both released so that when starting Vbutton E ASTB is pressed energy is not.

supplied to either of the relays I ZST or 5 6ST. However, if conditions are such that pressing of starting button 3 4STB causes energyto be supplied to relay I ZST or 5 6ST, its contacts will pick up and establish a stick circuit for the relay, while the relay will cause a control code to be transmitted to the associated station as explained below in connection with relay 3 4ST,

When relay B LlST is actuated, that is, picks up, its contact 20 establishes a circuit including back contact 2l of selector relay 3--4S for supplying energy to the oiilce coding unit toy cause it to initiate transmission of a code to station 3 4, as explained in detail in the above-identilied patents to Lloyd V. Lewis and George W. Baughman. During operation of the ofce coding unit to transmit this control code, the relay OM is picked up, while, when the oil'lce coding unit transmits the stati-on selection steps which identify lstation 3 4, the selector relay 3 48 picks up. When relay B ES picks up, its contact I2 transfers the stick circuit for relay i-QST from the direct connection with terminal B of the battery to the connection governed by back contact 23 of relay OM, but as relay OM is picked up during transmission of control codes the relay s ST releases and interrupts its stick circuit. The relay 3 4S, is picked up during receipt of an indication code from station 3 4, and the circuit provided by back contact 23 of relay OM prevents release of relay'3 4ST at such times- When relays-AST is restored to normal, that is, releases, its Contact Y 20 in the circuit leading to the oiiice coding unit is open so that energy will not be supplied to this circuit on release of relay 3 4S which occurs at the endof" the control code transmitted to station 3 4. The code transmitted to station 3 4' at this time is a normal control code having a full complement of sixteen steps, and thefunction steps of the code will position relays at the field station in accordance with the position of the switch and signal levers or other control means associated with this panel of the C. T. C. machine.

VIf relay I ZST or E SST is picked up, it is unaffected by transmission of the control code to station 3 4, while each of these relays causes a control code to be transmitted to the associated station, and each is released when the associated selector relay l-QS or 5 68 picks up during the transmission Iof this control code.

If the operator wishes to transmit a -recall code to station 3 4, he may do so by pulling the starting button 3 15STB instead of pushing it. When this button is pulled, conta-ct 25 of the button is closed so that energy is supplied to the upper winding of the auxiliary relay B ARCST and its contacts pick up so that energy issupplied over push button Contact 25 and front'c'ontact'z of relay 3 4RCST to the winding of relay 3 4ST. Accordingly, the contacts of relay 3 4ST pick up and Contact I I establishes the relay stick cir-cuit, while energy from this circuit is supplied over front contact 26 of relay 3 4RCST to the upper ftioriV of theoperation of the equipment at'such times is not necessary.

This apparatus is arranged so that if at the time "the operator decides to send a recallV code to station 3 4 a control code is awaiting transmission to another station, the recall code for station 3 4 will not interfere with this stored control code, nor willthe stored control code interfere with the recall code for station 3 4.

For purposes of illustration it will be assumed that the operator has pressed a starting button Vto energize the starting relay for one of the other "stations, such as station S,` and that this control code has not been transmitted at the time the operator decides to send a recall code to station 3 4. Under these. conditions, relay E GST is picked up at the time starting button e-isTB Vis pulled to pick up relays 3 iST and 3 4RCST.

When relays 3 4ST and 5 5ST are both 'picked up, each establishes a circuit over which energy may be supplied to the office coding unit to cause this unit to transmit a code. At such times Ythe oiiice coding unit operates as explained 4in the above-identified patent to Lloyd V. Lewis to transmit a code first to one station and then `tothe other station, the order of transmission of theY codes to the two stations being determined by the relative superiority of the code calls assigned to the two stations.

As explained above, when the code is transmitted to stations 3 15, the relay 3 4S picks up to'r'elease the starting relay 3 ltST and to pick up the relay RCR so that the code sent to station 3 4 is a recall code. This method of operation takes Vplace regardless of Whether the code sent e to station 3 5 is transmitted before or after the code isv sent to station 5 5. This is true because 'the operation of the equipment for the panel governing station 3 #3 is in no way affected by the position lof the contacts of relay 5 6ST or by the operation of the office coding unit in transmitting a code to station 5 6. Y

Similarly, relay 5 5ST remains picked up until a code is transmitted to the associated station, whereupon it releases. During transmission of ,the code to station 5 5 front contact 36 of relay y5 655 and front contact 3! of relay OM are closed but energy is not supplied to relay RCR since contact 38 of relay 5 5RCST is open.

Accordingly, relay RCR remains released and the code sent to station 5 5 will not be a recall code, but will be a normal control code and will position the function control relays at that station inaccordance with the position of the levers on the panel in the ofce. This is proper since the code sent to station 5 5 was intended tobe acontrol code and not a recall code. Since the code sent to station 5 6 is certain to be anormal controlcode the functions which the operator intended to have performed when he initiated the transmission of the control code to this station are certain to be carried out. Y

. If the control code stored for transmission to station 5 6 should be converted to a recall code, the starting relay 5 5ST would be released as a Vresult of transmission of the recall code and the control code intended for this station would not be transmitted, while the functions intended to be Yperformed by the control code would not be carried out. Although thefailure of these functions` to be carried out cannot create a hazardous condition, and the operator can readily correct the situation by pressing the starting button 5 6STB toV pick up the relay 5 6ST and thereby cause a control code to be transmitted, considerable timel Themodication shown in Fig. 2 employs Ymeans shown and claimed in application for Letters Patent of the United States Serial No. 708,920,

might elapse before the operator becomes aware of the fact that the control code intended for station 5 6 has been cancelled and as a result there might be considerable delay in the control oi traffic in the stretch. This recall control system eliminates this potential source of delay by. insuring that transmission of a recall code to one station does not interfere with the transmission of a control code stored for transmission to another station.

This recall controlfsystem operates so that if at the time the operator decides to send a recall code to a station, a control code is stored for transmission to that station, the control code will not be sent to that station but will be cancelled in favor of the recall code.

For example, if the operator presses the starting button 3 6STB to send a control Ycode to station 3 4, the relay 3 4ST willfbe picked up and will remain picked up until the code is transmitted to this station. If, before the code is sent to station 3 4, the operator decides tosend a recall code to this station and pulls the starting button 5 5STB, the relay 5 4RCST will be picked up and the relay 3 1ST will remain picked up. As explained above, the code sent to station Modification shown in Fig..2 Y

In Fig. 2 of the drawings there is shown a modied form of recall code control means similar to that shown in Fig. 1 but operating to insure prompt transmission of the recall code and of the indication code from the recalled station.

Except as hereinafter specifically pointed out the modification shown vin Fig. 2 is substantially the same in construction and operation as the modification shown in Fig. 1. Y

the

filed by us on November 9, 1946, for Centralized traic Vcontrol systems, for governing the transmission of codes by the oflice coding unit so that a code may be sent to a station before a code is sent to a superior station, and so that codes stored Lfor transmission Will not be transmitted until predetermined conditions are complied with.

In the modification shown in Fig. 2 the transrnittingcircuits governed by the starting relays for supplying energy to the oiiice coding unit to cause it to transmit a code, such as the circuit including front contact 20 of relay 3 4ST, are governed-by contacts of the auxiliary relays RCST so that whenever an auxiliaryrelayis .picked up, energy` is supplied to the circuit governed by the associated starting re1ay,.while the supply of energy to the transmitting circuits governed by al1 of the other starting relays is'interrupted.

Y Referring to Fig. 2 of the drawings it Will be seen that terminal B of the battery is connected over a; circuit including in series therewith a back contact of each of the auxiliary relays RCST in the oflice machine. As shown this code transmission control circuit includes back contact 40 of relay I ZRCST, back contact 4l of relay 3 4RCST, and back vcontact 42 o f relay cama-.rae

fS-Y-LSRCST. las *eveil fas a backcont'act :of Scorre spending relays `(notshoiil'n) `for other panels 'in .the machine. Accordingly, this circuit isco'm- .plete when and Vonly Whenall ofthe relays RCSFI' are released.

Each auxiliary .relay .RCST, lWhen released, connects .a'contact of the associatedfselectorlrelay `S .to "thefco'de transmission .control :circuit gov- .erned `by the back contacts `of .the relays RCS'I .in series, .and when picked up :connects -ithe .selector .relay `Contact `directly Yto terminal l?. 1.0i Etheiloattery.` 'Forexampla Whenrelay -edRCST iis released, contact ,2l of `selector `.relay aS-S is .connected .over .back .contact t4 fof .relay f.'i-RCSTto .the circuit governed lby vvback contacts .off all lofV the auxiliary relays, .andwhen Yrelay .3-4RCST ispickedup `contact 2l `cir-:selecitor relay '1i-4S is connected I.directly to .terminal .Bof .the source.

"Accordingly, when .relay Vrn'RCSTis released, energy will be "supplied .to the transmittingcir- Inuitggoverned by contact 2i of 'selectorrelayi'f---ts fonly "if' .every .other auxiliary .relay RCST'inthe imachine .is released. On the other hand, when :relay S-'ARCST is picked up, energy iwill loe sup- .plied tto, the transmitting circuit governed by contact 2| of relay --f''S irrespective of the fcondition of the other auxiliary relays `in v:the

machine.

.identified patent to Lloyd V. Lewis.

The operation of the modification shown in Fig. 2 -in `transmitting a normal control .code to a stationis substantiallythe same as the modi- Vilcation shown in Fig. 1 and-a detailed .explanation `of the operation of the equipment at such i I times is unnecessary.

if `the operator Wishes to send a treoall `code .to station 3 4, he may Vdo so by-pulling the start- .ingbutton 3-4STB so that contact 25 establishes .the 'circuit Vincluding back contact 45 of relay -AD for supplying energy to the upper Winding fof relay -ARCSIX If, at the Atime the Astart- .fing button 3--lSTB is pulled, the relay 43---liD is picked `up showing that `an .indicationcode is being received from station 3J-4, the `relay S-.JIR'CST will remain released zand the Vrecall `code will not be initiated. This is properlsince the indication code which is being recevedlprovides the information which the recall code is :intended to secure so thelrecall.codeisunneces Sary.

1f, at the `.time :the `naming button .a-es'rB .is pulled, the relay 3-4Dis released, `Venergy `vvill be supplied to the ,upper winding of relay `3---llRCST and its 'contacts will pick up with `the .result that before the 4startingbutton is released energy will "be supplied .over `iront vcontact v2.6

of vrelay B-llRCSTto relay S-JSST and its'con- 1tacts will pick up. When relay t-eST picks up, its .contact Il yestablishes the relay stick cir- .cuit, `vvhileenergy from Lthis circuit is :supplie-d .over front .Contact 2B of relay 3-`4RCST to Ythe upper Winding, of `the relay to insure that the .relayfcontacts remain picked up as long yas relay ,3 '-'4S\'I".is.pickedup.` -At :thistime energy is supico plied to'tne .lower minding' oi "relay 'ttiacsll -1over.lthefcircuit including front contact. 29 .of relay 3l-ARCS? :and'back .contact :of relay "3-4D.

. .Whenirelay.SQdRCSTfpicksup its'c'onta'ct 4i interrupts the. code .transmission control .circuit ywhich .includes iback contacts .fof all .of 'the .auxiliarylelays infseries, While Contact 44 'of relay .3--'4RCST disconnects r-elay -llsfromthis Acir-- cuit and connects it directly to terminal B so that `energy is supplied over back .contact `2l .-of :relay @-#S :and :front icontact 2@ of relay :3f-4STttotheofflceecodingunit .to cause itto send afcodetofstationiSe-.

When "relay {ie-eRCST picks up iand `relays |-2RCST1and..5-RCST rare released, :contact A411| of relay 3-RCST-interruptstthe transmitting circuit governed by `back contact 36 of relay .5,65 fand front contact el of relay .5EST for supplying energy to the .cnice `coding unit. At .this time 4contact il of relay Se-GRCST also Ainterrupts .the transmitting circuit governed by back zcontact "43 vof .relay Ier-2S and frontlcon- .tact Vlli) of relay I-ZST for supplying energy to the .ofce coding unit. As a result, after -relay `s llRCST .picks up, the :relays .l-eZST 'and .E-GSTare-ineifective tocontrolthe-ofce coding unit. to cause .codes to be .transmitted to these stations.

`.erccordingly,1if the -,operator .had .caused relay l-2ST or E-SST to .be energized so as .to cause a control code to .be .sent -to either or `lcothof these stations, .but these codes had not been .transmitted before the operator-decided to `send "the recall codetostationta, `so that relays l--ZSI .and `.lle-6ST are picked up at .the time .relay 3-4RCSTbecomespickedup the olce .coding unit will not .operate .to .send .codes to `stations .I-2 .and .5 6 .as longas relay -S-ARCST .is picked up. The transmission of the recall .code .to station V-3.l, V.thereforeris.not delayed-by translmission dtstored. control codes .to superior stations. .As .hereinafter explainedy .after transmission of the recall code to station 3 4, the relay .S-ARCST remains .picked .up untilan indication code isrecived fromfthat station. .As a .result, after transmission .of the recall .code to station isf-4, the` code une win not be occupies' Vby,transmission-of .sto-red .controlcodes to inferior stations. 1

It will`be.. seen that the ...operation of theoice 1,eiquiprnent is `such that when a recall code is "initiated it prevents .transmission of ,codes to any station except the recalled station. As Val result .the recall code is transmitted promptly .and the codeline is then made available for :the indication codeffrornthe recalledstation.

previously explained, `vv'lfien relays .'i-RCST and 3-4ST are.pifzked upfenere-y is supplied `.over lfront contactll .of.rlay"3liRC`ST, back Contact?! of reIayE-GS, and iront contact-2! of relay .3f-.4ST to theoiice coding unit and causes lit 4to .transmit a vcode to .stations-1t, .While the relaysOMand-LBP are pickedfup. `I`When the .stationselectionsteps of the .code.are transmitted, .the-.relay .3f-4S picks up and .its .contact i2 `transfers lthe s tick..circuit `.for relay -llST to theircuitgovernedby contact.23of relay OM .which ils-,open `at this ytirne.'` Accordingly, relay .-ST-releases VWhile thesupply .of energy to theupper `Winding of relay '3-rlRCST .is cut off, vbut thecontacts .of relay -QRCST are main- .tainedlpickedupby energy suppliedto the lower .Winding of the .-relay rover the :circuit i governed l"by backontact 45 for .relayliteellD. 4ns rrelai 3 4CST remains picked up after-relay 3 4S picks up, energy is supplied over front contact 44 of relay 3 4RCST, front contact 2| of Yrelay 3-4S, front contact 30 of relay 3-4RCST, and front contact 3l of relay OM to relay RCR and its contacts pick up to establish the relay stick circuit, and to alter the operation of the oice coding unit so that the codefsent to station 3 4 is a recall code with the abnormally long ninth step.

As explained in connection with Fig. 1, the transmission of the recall code results in release of relays 3 4S, OLBP, RCR and OM, but in this modification the relay 3 4RCST is maintained picked up by energy supplied over back contact 46 of relay 3 4D. As relay 3 4RCST remains picked up its contact 4l continues to interrupt the transmitting circuits governed by the selector and starting relays of the other panels for supplying energy to the o'ice coding unit to cause codes to be transmitted to the field stations controlled through these panels.. Accordingly, after the recall code to station 3 4 has been transmitted, the oice coding machine ceases to transmit and is prepared to receive indication codes.

'I'he recall code sent to eld station 3 4 energizes the starting relay at this station and thereby causes an indication code to be sent from this station to the oiiice.

Prior to the transmission of the recall code to station 3 4 the starting relay at one or more superior eld stations may be` energized as a result of train movementor of control codes received from the office. If there are indication codes stored at stations superior to station 3 4 these indication codes will be transmitted prior to the indication Ycode from station 3 4. Since Vthis recall control means operates to prevent transmission of control codes as soon as a recall code is initiated, the number of stations'having indication Icodes stored for tr-ansmission is Aheld to the minimum so there is a minimum of delay in the transmission of the indication code from station 3 4 to the oiiice.

When the indication code from station 3 4 is received at the ofilce the relay 3 4D picks up momentarily to cause indication relays, not shown, to be positioned in accordance with conditions at the field station, while contact 46 of relay 3 4D interrupts the supply of energy to the lower winding of relay 3 4RCST and its contacts release so that contact 26 is open and prevents supply of energy to the relay winding on release of relay 3 4D.

When relay 3 4RCST releases its contact 4I in the circuit governed by back contacts of -all of the relays RCST is closed and, if the starting relay for any panel is picked up, energy will be supplied to the oilce coding unit to cause a control code to be transmitted to thecorresponding Y station.

The equipment operates in a similar manner during transmission of a recall code to one of the other stations, as for example, station 5 6. When a recall code is to be sent to this station the starting button 5 6STB is pulled to pick up relays E SRCST and 5 6ST. When relay 5 6RCST picksV up, its contact 42 interrupts the cir-cuit governed by back Acontacts of all therelays RCST so that control codes will not be transmitted to other stations until the indication code is received from station 5 6. When relay E GRCST is picked up, its contact 50 connects contact 36 of relay 5 6S to terminal B of the 'source so that a code will-be sent to station 5 6 and so that this code will be arecall code." When an indication is received fromV the recalled station the relay 5 ED picks up momentarily and releases the relay S-GRCST and on closing of its contact 42 energy may be supplied to the other panels to cause a control code to be sent if the starting relay for a panel is picked up.

This modication is arranged so that the operator may initiate recall codes to more' than one station if he desires to do so. For example, the operator may wish to obtain indications from station 3 4 and station 5 6 and inorder to do so he pulls the starting buttons 3 4-STBV and E SSTB, thereby picking up relays 3 4RCST and 3 4ST and also picking up relays E SRCST and 5 6ST. When relay 3 4RCST picks up, its contact 44 establishes the transmitting circuit governed by relays 3 4S and 3 4ST for causing the ofce coding unit to initiate a code. Similarly,

when relay 5 6RCST is picked up, its contact 5i! establishes the transmitting circuit governed by relays E GS and 5 BST for causing the oiiice coding unit to initiate a code. code will be sent to station 3 4 even though contact 42 of relay 5 6RCST is open, and a code will be sent to station 5 3 even though contact 4| of relay 3 4RCST is open.

As relays 3 4RCST and 5 6RC'ST are picked up, control codes will not be sent to other stations until indication codes are received from both of the recalled stations. For example, if relay I ZST is picked up showing that a control code is to be sent to station I 2, this code will not be sent asV long as either relay 3 4RCST or relay E SRCST is picked up. K

When recall codes are initiated to stati-ons 3 4 and 5 6, the codes to these stationswill be transmitted one at a time, the order of transmission of lthe codes to the two stations being determined by the code Icalls assigned tothese stations. `The relay RCR picks up during the code transmitted to each of these stations so that the codes are recall codes. rIhese codes energize the starting relays at the recalled stations and cause indicati-on codes to be sent to the office. The operation of the C. 'I'. C. system is such that control codes, thatiacodes originating at the office, take precedence over codes originating at the eld stations so both recall codes will be transmitted before an indica- 'tion code can be transmitted from either eld station.

After the recall codes are complete indication codes are transmtited to the oice from stations 3 4 and 5 6, the order of transmission of the 'codes being determined by the relative superiority :of the two stations. The indicati-on code first `transmitted to the oiiice releases one of the'relays :codes so indication codes from the recalled sta- 'tions will'not be delayed by control'codes, and

the stored control codes will be transmitted only after indicati-on codes have been received from all of the stations which have been recalled.

The modification shown in Fig. 2 issimilarto that shown in Fig. l in that a recall code intended if'or a station iscrtain to be sentto that station and not to another station, whilel transmissionv of a recall code to one station cannot result in can- Voellation of control codes stored for transmission -to other stations. In the modication shown in `Fig. 2, after a recall code is initiated, transmission Accordingly, a

As stated above, asV

anatra i7 of control codes toV other stations is-deferred until the indication is-received from the recalledstation, at which time` the control codes are' automatically transmitted and carry out the functions intended when they were initiated.

The modication shown in-Fig. 2 is also similar to that shown in=Fi`g.-l in that ifafcontrol code is stored for transmis-sion" to a stationat the time the operator decides tosenda recall vCode to the station, the control `code for that station will be Icancelled in favor of the recall code. 'The indication code received infresponse to the recall code will inform the operator whether orV not arcon trol cede should be sent to the station.

Although we have illustrate-d and described two forms of recall control*meansy einbodyingour invention, it is to be understood that numerous changes and modifica-tions' may be made therein within the scope of the appended claims Without ydeparting from the spirit and scope of our invention.

` Having thus des-cribedfour invention, what we claim is: t

1. In a remote control system of the type having an -oice and a .plurality of field stations,` the equipment at the oiiiceincluding o. code transmitter'fortransmitting different control codes to said stations each comprising a 'iirst group of elements adapted to select a station and -a second group of elements for operating movable .devices at the se lected station and also including recall means effective when actuated to interrupt the transmission of a code.following`,the selection of a stationand prior to operation of any of said movable devices, the equipment.at.each station including means .for initiating the operation of the ,associated transmitter in response toa change .in the condition of any of n thenmovable vdevices at such station. .and also inresponse tos-aid interrupted code provided -theinterrupted code includes` the selecting elements lto .which such station is slec- 'tively responsive, control means for governing said recall means, said control means comprising for each station an auxiliary relay havingcntaots which normally occupy a first position, manually .controlled .circuit means e'iective` when the op- ,eratoractuates control devices to transmita recall code to a selected station for moving the contacts of the auxiliary rel-ay for that station to their secondposition, meansfor actuating said .recall means when the-cnice code transmitter transmits a code including the selecting elements designating a station and .the contacts of thelauxiliary relayfor that station are in their second position, and. means for each auxiliary relay effective subsequent. to the transmission of the selecting elementsl of a code designating the corresponding station for causing the relay contacts to move from their second to their .rst position.

2; in a remote control-system of the type having an oiice and agpluralityof eld stations; the equipment at the ofce' including 'a code'transmitter for transmtiting diierentcontrol codes to said sta-tions'each comprising arst groupofelements ladapted to select a-station and a secondgroup of elements for operating movable devices at the selected stati-onV and also including recall meansefective when actuated to cause the iirst groupof "elements of a cod-etransmittedby said :code transmitter to loe followed by a single deliverywelement in place fof saidI second-group offelenients, the

`combination with the foregoing apparatus of con- 18 trol means `#for said recall fmeans, said y control means'acomprisngfor eachstation an .auxiliary relay'havin'g contacts v'vhich normallyroccupyfa rst position, manually controlled circuitfmeans eiiectivewhen the -operatoractuates `contr-'ol d'e- -vices tol transmita recall-code to a selected station for'movi-ng thelcontac'ts of the auxiliary relay for that-f s-tatior'rv tov `their second position, means fior transmitter transmits a 00de inclu-ding ftl'ie -Sleot- `ing elements designati-ng a station and the con- -tactsffof the.'auxiliary` relay for that station are their second position, and means for each auxiliary-relay"etfeotive subsequent? to' the transmission of'(tlielselectingelements ofa code designating` the correspondingstation for causing :thefre- -lay coifltacts to-move from theirsecond .tortheir '-is't position.

y BJYIn a remote control systernofthe type-hav- .ingfanoiiiee and a plurality of -fieldzstations' the equipment 'at the-"office :including ta`codeftransmitter for transmitting different codestotsaid stations yeach comprisingarst group of elements adapted to `select.V 'a station `.and Y a second.. group (if-elements for `.operating ymovable devicesaatzthe `selected-station.and `also including. recall v.means effective .when actuated to cause'.A the rstog'roup eleinentsfof a code' transmittedrbyasaidecode transmitter to be Afollowedbyfasn'gleadelivery element placefo'f said second group .of elements, the; equipment :at theV officer .including 'an starting relay =for each station, eachrstarting; relayebeing eiiectiye Vvvlien actuated to `renderse'lfective a ecircuit governingl the code `transmitter to ycausera :codo-to besent to' the corresponding station and being restoredto'norrnal in consequencetof transe -`mission of aV code' -to the` corresponding station,

theI combination :with the foregoing apparatus `of control .meanshforsaid recall fmeanspsaid-control Imeans .'comprising for `each station :.:an

auxiliary: relayhaving contacts-1whichvnorn1ally -occupyfa Ifirst 'n'ositiommanually `.,"ontrollee1 cir- `cuit .means l.at the oce torieachnstationieach aridftheffcontacts `ofthe auxiliary-relay for that `stationare= ini their second position,` andemeans `for each auxiliary relay effective subseouentoto :actuationwof said recall means over'..thecirctit governed (by 'said auxiliary-relay for causingtthe relay contacts 'to lmove to their'rst position.

14; In, a remote-control system Lof-fthe type' have :ing an office -andaipluralifty :of field `sta'tion'sgthe equipment at the oiimeV including ab code' transmitter *fori transmitting different codes 1 ltowsai'd stations each Vcomprising a iirst group of''elernents -adaptedfto-select station.` and asecond group not Volernerit'sfor `operating movable devices "atfthe -selecte'dtation and also including.` recallwmeans ieffectivemwhen actuated tdcause the first group .of felernntsf of a code' transmitted 4by said-code transmitter f to.l be followedi iby -i a single. delivery element in 'y .place Tnit-said second group .ofelements, the vequipment at the ocefincfludingza startingtrela'y. for. each station, eachstarti'ng? re- =ilay being effective. when actuated to render ellective `a A'circuit governing the code transmitterrto 'causer a'code to be sent to the corresponding stationvand being `restored to normal -in consquence of transmission of avcode to the corresponding station, the combination with the foregoing apparatus of control means for said recall means, said control means comprising for each station an auxiliary relay having contacts which normally occupy a rst position, a starting button at the office for each station, each starting button being selectively operative so that at times it will cause the associated starting relay to be actuated and at other times will cause the associated starting relay to `loe actuated and will also govern the associated auxiliary relay to move its contacts to their second` position, means for actuating said recall means when the office code transmitter transmits a code including the selecting elements designatinga station and the contacts of the auxiliary relay for that station are in their second position, and means for. each auxiliary relay eiective subsequent to actuation ofthe recall means over the circuit governed .by said auxiliary relay for causing the relay contacts to move to their first position.

5. In a remote control system of the type having aniofce and a plurality of eld stations, the equipment at the oice including a code transmitter for transmitting diierent codes to said stations each comprising a first group of elements adapted to select a station and a second group of elements for operating movable devices at the selected station and also including recall means effective when actuated to cause the first group of elements of a code transmitted by said code transmitter to be followed by a single delivery element in place of said second group of elements,

the equipment at the cnice-including a starting relay for each station, each starting relay being effective when lactuated to render eiective a circuit governing the code transmitter to cause a code'to be sent to the corresponding station and being restored to normal in consequence of transmission of a code to the corresponding station, the combination with the foregoing apparatus of control means for said recall means, said control means comprising for each station an auxiliary relay and a starting button, each starting button controlling circuits for actuating the associated starting and auxiliary relays and also controlling a supplemental starting circuit which at times may actuate the starting relay for a station other than that with which the button is associated, said 'circuits being arranged so that the starting button when operated in one manner causes the associated starting relay to be actuated and also `governs said supplemental starting circuit so that the starting relay governed thereby may be actuated, said circuits also being arranged so that the starting button when operated in a diierent manner causes the associated starting and `auxiliary relays to be actuated but does not govern said supplemental starting circuit rto actuate the starting relay governed thereby, means for actuating said recall means when the oflice code transmitter transmits acodeincluding the selecting elements designating astation and the auxiliary relay for that station` is actuated, and means for each auxiliary relay `effective subsequent to actuation of the recall means over the circuit governed by said auxiliary relay for causing the auxiliary relay to be restored to normal.

6.` Tn a remote control system of the type having an oflice `and a plurality of eld stations, the equipment at the ofce including a code transmitter for transmitting different codes to said Stations each comprising a first group of elements adapted to select a station and a second group oi' elements for operating movable devices at the selected stati-on and alsoVin-cluding recal1 means eiective `when actuated to cause the first group oi elements of a code transmitted by said code transmitter to be followed by a single delivery element in place of said second group of elements, the equipment at the office including a starting relay for each station, each starting relay being effective when actuated to render effective a circuit governing the code transmitter to cause a code to be sent to the corresponding station and being restored to normal in consequence of transmission of a code to the corresponding station, the combination with the foregoing apparatus of control means for said recall means, said control means comprising for each station an auxiliary relay and a starting button, each starting button controlling circuits for actuating the associated starting and auxiliary relays and also controlling a supplemental starting circuit which at times may actuate the starting relay for a station other than that with which the button is associated, the .circuits controlled by each starting button being arranged so that when the starting button is operatedto actuate the associated auxiliary relay it will not control the supplemental starting circuit to actuate the starting relay governed thereby, means for actuating said recall means when the cnice code transmitter transmits a code including the selecting elements designating a station and the auxiliary relay for that station is actuated, and means for each auxiliary relay effective subsequent to actuation of the recall means over the circuit governed by said auxiliary relay forl causing the auxiliary relay to be restored to normal.

7. In a remote control system of the type having an'olilceand a plurality of field stations, the equipment at the ofiice including a code transmitter for transmitting dilerent codes to said stations each comprising a first group of elements adapted to select a station and a second group of elements for operatingmovable devi-ces at the selected station and also including recall means effective when actuated to cause the 'frst group cfvelements of a code transmitted by said code transmitter to be followed by a single delivery element in place of said second group of elements, the equipment at the oice including a starting relay for each station, each starting relay being effective when actuated to render effective a circuit governing the code transmitter to cause a 'code to 'be sent to the corresponding station and being restored to normal in consequence of transmission of a code to the corresponding station, the combination with the foregoing apparatus of control means for said recall means, said control means comprising for each station an auxiliary relay and a starting button, each starting button controlling circuits 'for actuating the associated starting 'and auxiliary relays and also controlling a supplemental starting circuit which at times may actuate the starting relay for a station other than that with which the button is associated, the circuits controlled by each starting button being arranged so that the starting button when operated in one manner causes the associated starting relay to be actuated and also governs said supplementalstarting circuit so that the starting relay governed thereby may be actuated, said starting button being ineiective when operated in said one manner to actuate the `associated auxiliary relay, said circuits also being arranged so that the starting button when operated in a different manenligne `2i ner :causes :'thefassociated auxiliary :relay` to: be actuatedandto thereafter..cause the associated starting relay toibeaotuated,.saidLstartinglbntton being ineiiective whenoperated. in :said.different manner to .governisaid.supplementalastarting. circuit to actuate. the starting relayfgoverne'd theree by,` means.fonactuatingisaid: recall means ,when the office codetransmitter'transmitssarcode in-` cluding. the selecting: elements designating a .sta

tion-vend'` the auxiliary;` relay l,for that-station is f actuated, andnmeans `for each auxiliary relay for causing the-relay. to berrest-ored toty normalfllron videdy the associated starting relayl has VbeerrreM stored,tonorm'aL` the restoring means,- for each auxiliary relay being -:automatically rendered eliective subsequent :to actuation; of the :recall means over the circuit governed bythe auxiliary relay.

f8. lin-,a remote controlsystem of thetype =liav ing anv office and a-Lplurality of iieldfstations,` the equipment at thev oilice including acode trans* mitter -for transmittingV different. codes to said stationseach comprising a, rst group of elements adapted toselect a station and av seco-ndgroup of elements for Aoperati-ng-A movable devi-ces at the Selected station` `and alsoi including recall means effective whenv `actua-ted to cause the first group of `'elements of a lcode transmitted bysaid code transmitterito bezfollowed by a singledelivery element in place of saidseoond group of elements, the equipment atti-1eoflioe including a starting relay for each station,V each starting relay being eiective when actuated to render effective a circuit;governingithewcoole transmitterto cause a code tobe sent to thelcorresponding station and 'be-ing restored tonorm-al in consequence of transmission. fof, a code .to -.the.corresponding station, the .combination With'theieregoing apparatus of control means forl saidrecall means,` said control means*v comprising' for ea-chf-,stationfan lauxiliary relay and astartingbutton,` each' starting button fbeing operative Ain afirst or *aV second manner, each starting button being Veiifectiveli'pnlywhen operated in said-nrstavmanner to actuate-,the;associated starting relay and i to also=` govern la, circuit whichat times lactuates lthe starting relay for. :a stationotlier than that with which Ythe buttonzis associated, each starting button being effective only when operated: insaid i ysecond marmer to aotuate. theel-associated startingv and auxiliary, relays;-` each -V auxiliary-relay `when :actuatedA rendering effective a'circuit. operative to 1actuate said recallv means when lsaid code transrm'ttery transmits-accade designating'the station Witlifwhich saidlauxiliaryrelayis associated, and means; for each auxiliary relay forcau-singthe "relayzto'zjbe restoredY to normal, eachsuchl means vloeing'effective only when1 the :associated starting relay is in its normal `position and being' automatically op# erative r subsequent1 to actuation of the recall means over the circuit governed Icy-said auxiliary relay.

9. In a remoteicontrolrsystem of; the'type' -havingan office-and a; pluralityof fieldn'stations, 'the equipment atfthe oiiiceiincluding afocdetransmitter ior'transmitting different codesto Ysaid stations each comprisingaiirst groupoi elements adapted; to select-a station and a "second group of elements 1 forV 'operating' movable ,devices at the selectedsstation and also including recall` means effective fyi/hen: actuate'df to 1 cause the `rst group of `elements ofacode transmitted-bysaid code transmitterito .:be followed, by a-.single I 'delivery element -inxplace ofasaid secondg'roup of elements, the equipmenteat 'the '.oflice". :including a .starting 22 relayfi forcach?,statiomeach startingf relayl'lb ein'g eiective when :actuatedto render. effective a: circuit .governing thezcode transmitterito fcausesa code. to` be` senttoltloelv .corresponding xstation and being, restored to normal .inconsequence :oil transmissiorioffascodet to theeeorresponding station,` the combinationrWith-Jfthe foregoing apparatus. :of control `means ior.A saidu recallameans, said lcontrol means comprising for .each station an auxiliary relay and manuallyLoontrolledoircuit means, each such -icircuit meanszbeing .selectively operative` to at time-s ,actuate fthe associated starting `relay without; .actuating the.4 associated auxiliary. relay and to at iothentimesiactuate: the `associated.auxiliary: relay andi tothereafter. acuate the associatedstarting relay, mean's foractuating said recall l means, when theoices. code i transmitter transmits a :code including. theselecting elements designati-nga stationand'theauxiliary relay for tliattsta4` tion f actuated, ;.and means 1 for each .auxiliary relay for causing theirelay to be restored-toir normal provided theaassociated startingrelaylhas been` restored to' normal; theV restoring meansufor each auxiliary relaylbeing automatically rendered effective:subsequentato'actuation vof the recall means over the rcircuit governed lbyJthe auxiliary relay. i

10. In a remote control-"system ofthe type having` an oice and ai plurality. of eld station's,rtne equipmentat the oiiice including a code transmitter for transmittingfdifferent codes to said stations eaclicomprisin'garst group ofelement-s adapted to selectastation anda second group of elements for operatingmovable Vdevices Yat.tloe selected station andualsoincluding recall means effective when .actu-atedfto cause ther irst Vgroup of-elementsiof a code transmitted by said cod-e'. transmitter V:to -be followed by a single delivery element inplaoe'of said second group of elements, the equipment .atr the oiiiceincluding a" starting relay for each station,feach startingl relay being eiective whenazactuatedftof'ren'der effective :a'tcir` cuit `governingthe cod'eftransmitter tof cause a code to`be sent tothe Vcorresponding station and being restored tonormal in consequence of transmission ofafeode tothe'corresponding station, the combination withA the foregoing apparatus of ccntrol `means forfsaidreca'll'means, said control meanscomprising for eachl station an auxiliary relay yandinanuallyzcontrolle'd ycircuit means, each such circuit'meansbeing 'selectively operative to at times Jar'atuatefthe `,associated starting relay without actuating the associated auxiliary relay and to at other timesactuate the associated start; ing relay `andI tov'alsowactuate the associated auxiliaryurelay-meansfdr each auxiliary relay for automatiealilyrcausing` they relay to be restored to normal-subsequent totransmission of a code to the associated station, and means operative when and only `when said code transmitter transmits a code designatingastation 'and the auxiliary relay, associated 'with that station is actuatedfor actuating said'recall means.

ll. Ina'remotecont'rol system of the type having an office anda plurality of i'leld stations; the equipment` atlthe cnice including a code transmitter for transmitting different codes to said stations eachH comprising a first group of elements adaptedto select a station anda second groupY of elements for operating Amovable devices lat the selected stationV and 'also'including recall means effective when actuated to cau-se therst group of `elementso'f a code transmitted by said code transmittertobe `followed by-a single delivery el ement. inplace; off saidfsecon'd group 'of elements,

the equipment at the office including astarting relay for each station, each starting relay being effective when actuated to render effective a circuit governing the code transmitter to cause a code to be sent to the corresponding station and being restored to normal in consequence of tran-smission of a code to theV corresponding station, the equipment at the ofce also including means for receiving indication codes from the diierent field stations, the combination with the foregoing apparatus of control means for said recall means, said control means comprising for each station an auxiliary relay and manually controlled circuit means, each such circuit means being selectively operative to at times actuate the associated starting relay without actuating the associated auxiliary relay and to at other times actuate the associated starting and auxiliary relays, means for actuating said recall means when the office code transmitter transmits a code including the selecting elements designating a station and the auxiliary relay for that station is actuated, and means for each auxiliary relay responsive to receipt of an indication code from the associated station for causing the auxiliary relay to be restored to normal.

12. In a remote control system of the type hav` ing an oiiice and aplurality of field stations, the equipment at the oiiice including a code transmitter f or transmitting different codes to said stations each comprising a rst group of elements adapted to 'select a station and a second group of elements for operating movable devices at the selected station and also including recall mean-s effective when actuated to cause the rst group of elements of a code transmitted by said code transmitter to be followed by a single delivery element in place of said second group of elements, the equipment at the oice'including a starting relay for each station, each starting relay being effective when actuated to render effective a circuit governing the code transmitter to cau-se a code to be sent to the corresponding station and being restored to normal in consequence of transmission of a codeto the corresponding station, the equipment at the office also including means for receiving indication codes from the different field stations, the combination with the foregoing apparatus of control means for said recall mean-s, said control means comprising for each station anauxiliary relay and manually controlled circuit means, each such circuit means being selectively operative to at times actuate the associated starting relay without actuating the associated' auxiliary relay and to at other times actuate the associated starting and auxiliary relays, means for actuating said recall means-when the oiice code transmitter transmits a code including the select ing elements designating a station and the auxiliary relay for that station is actuated, and means for each auxiliary relay for causing the relay to be restored to normal provided the associated starting relay has been restored tonormal, the restoring means for each auxiliary relay being auto matically rendered effective upon receipt of an indication code from the associated station.

13. In a remote control systemV of the type hav' ing an office and a plurality of stations, the equipment at the oilice including a code transmitter for transmitting different codes to said stations each comprising a rst group of elements adapted to select a station and a second 'group of elements for operating movable devices at the selected station and also including recall means effective when actuated to cause the rst group ofelements of a code transmitted by said code transmitter t0 be followed by a single delivery element in place of said second group of elements, the equipment at the oiiice including a starting relay for each station, each starting relay being adapted when actuated to render eiective a control circuit for causing said code transmitter to transmit a code toY the corresponding station. the combination with the foregoing apparatus of -control means for said recall means, said control means comprising for each station an auxiliary relay and manually controlled circuit means, each auxiliary relay when actuated conditioning the associated starting relay when actuated to be operative to render effective the control circuit governed thereby regardless of the condition of the other auxiliary relays and conditioning all other starting relays to be inoperative to render effective the control circuits governed thereby as long as the auxiliary relays associated therewith are not actuated, each manually controlled circuit means being selectively operative to at times actuate the associated lstarting relay without actuating the associated auxiliary relay and to at other times actuate the associated starting and auxiliary re-V lays, means for actuating said recall means-When the cnice code transmitter transmits a code including the selecting elements designating a station and the auxiliary relay for that *stationis' actuated, and means for each auxiliary relay for causing the relay to be restored to normal provided the associated starting relay has been restored to normal. Y

14. In a remote control system of the type having an oice and a plurality of stations, the equipment at the oice including a code transmitter for transmitting different codes to said stations each comprising a first group of elements adapted to select a station and a second group of elements for operating movable devices at the selected station and also including recall means eiective when actuated to cause the first group of elements of a code transmitted by said code transmitter to lbe followed by a single delivery element in place of said second group of elements, the equipment at the office including a starting relay :for each'station, each starting relay being adapted when actuated to render effective a' control circuit for causing sai-d code transmitter to transmit a code to the corresponding station, the equipment at the oiice also including means for receiving indication codes from the different field stations, Ythe combination with the foregoing apparatus .of control means for said recall means, said control means comprising for each station an auxiliary relay and manually controlled circuit means, each auxiliary. relay Vwhen actuated conditioning the associated starting relay when actuated to be operative to render effective the control circuit gov-l erned thereby regardless of the condition of the other auxiliary relays an-d conditioning all other starting relays to be inoperative to render effec' tive the control circuits governed thereby as long as the auxiliary'relays associated therewith are not actuated, each manually controlled` circuit means being selectively operative to at times ac' tuate the associated starting r'elay without actuating the associated auxiliary relay and to at other times actuate the associated starting and auxiliary relays, each auxiliary relay when actuated rendering effective a circuit operative to actuate said recall means when said code transmitter transmits a code designating the station with which said auxiliary relay is associated, and means for each auxiliary relay responsive to resancerre ceipt of an rindication code'ffrom the associated station for causingtliefauxiliary relay' to be restored to normall- 15. InV aremote` control systemA of the'type having` an oiii'ce and apluralitycfstations, the equipment at'the olice includingafcodetransmitter for transmitting different codesto -said stations each comprisingv a ii-rst group' of* elements adapted to selecta station andfafsecond'group of-elements for operating movablefdevicesfatthe-selected stationv and also inclu-dingY recall-means 'eiective when actuated to cause theifirst groupv of elements of a'codeftransnrittedf byfsaid; code'ftransmitter to be followedy by a singledelivery element in place of said secondgroupofelements, the equipment at the oiiice including a starting relay for each station, each' starting relay being adapted when actuated to render eiiective a control circuit for causingsaid code transmitter to transmit a coderto the correspondingstation, the equipment at thevofiice` alsoincludirig means for receiving` indicationcodes fromtlie different field stations, the combination with the foregoing apparatus ofcontrol meanswforsaidrecall means,

said control means'comprising for each stationl an auxiliary relay and manually controlled" circuit means, each`V auxiliary relay when actuated conditioning `the associatedsstarting relayV when actuated to be operative to. render'effective the control circuit governedI thereby'regardless `of the condition of the otherauxiliaryr relays and conditioning i all: `other starting relays to 'be inoperative to render. eifectivethe control circuits governed thereby' as long as the-auxiliary relays associated therewith-are notactuated, each: manuallyl controlled circuit' means Vbeing. selectively operative to at ftimes actuatef the associatedstarting relay Withouti actuating the associated auxiliary relay and to at other. times. actuate the associated .starting and-auxiliary relays; each auxiliary relay. when actuated rendering effective: al circuit operative-to: actuate said recall means. when said code transmitter transmits a code Idesignating the station 'with which said auxiliary relay is associated, and Imeans for each auxiliary relay for causing, the relay to. beY restored to normal, the restoring means for each auxiliary relay being operative only if theassociated starting` relay has been restored to normal and being automatically rendered effective uponreceipt of an indication code from the associated station.

16. .In `a remote control system of the type having an ofiicezanda pluralityv of stations, thebequip.- ment at the office including a code transmitter for transmitting different codes to said stations each comprising a iirst group of elements adapted to select a station and a second group of elements for operating movable devices at the selected station and also including recall means eiective when actuated to cause the first group of elements of a code transmitted by said code transmitter to be followed by a single delivery element in place of said Second group .of elements, the equipment at the oiice including a starting relay for each station, each starting relay being adapted when actuated to render effective a control circuit for cau-sing said code transmitter to transmit a code to the corresponding station, the equipment at the office also including indication code receiving means comprising for each station a delivery relay Which'is actuated temporarily during receipt of an indication code from the corresponding station, the combination With the foregoing apparatus of control means for said recall means, said control means comprising for each station an auxiliary relayl and manually controlled circuit means; eachauxiliaryrelay when actuated 4com ditioning the associatedfstarting relay` when ac# tuated to be operative-to render effective the 'com b trol circuitgovernedthereby regardless of the condition of the other auxiliary relays and conditioning alli-other startingrelays to be inoperative to render 'eiective the v`control-=circuits governed therebyas long as the auxiliary relays asso-` ciated therewith are noti-actuated, each manually controlledV circuit means being selectively operative toat times-actuateethe associated starting relay Without actuating the associated auxiliary relay and to atfothertimesactuatethe associated starting and auxiliaryrelays, each auxiliary relay when actuated rendering i effective a circuit `operative toactuater'saidrecallmeans whensaid code transmittertransmits a code designating the stationwithV whiclrsaid auxiliary-relay is associated, and meansafor each` auxiliary relay for causing the relay'sto abe restored' to normal upon actuation ofthe` 4associateddelivery relay-'providedA the assocatedistartingrelay hasbeen Vrestored toinormal.

17;'111 a remote control systemof thel type having an ofceanda pluralityrofiield stations-f the equipment at thefoiliceinclu'ding acode trans-V mitter for transmitting'diierent4 codes to saidstations each comprisinga first group ofelements adapted tofselect a station` and a=second group of elements for operating-movable'devicesatithe selected stationiand also includingirecal-limeans' effective when actuated Ito cause the firstgroupof elements ofa codeitransmitted by isaidcode" transmitter toibo-followed by alsingle deliveryv element in place of said second group of elements; the equipment at thefoflice including for each station a transmitting circuit operativev when renderedeffective to causethe code transmitter' to transmit a-.code to the corresponding station; the equipment atithe-oiiice Valsoincluding for each station a startingrelay effective whenactuated to render' effective4V the associatedtransmittingf circuit, each starting relay being-restored tono1-` mal in consequence/of transmission of a code `to the' corresponding station,- the combination-With the foregoing means ofcontrol means comprising' for each station an auxiliary relayand" circuiti l-Ii means controllable byl-theoperator in one mancontrollable in afV diff erentmanner` tov actuatethfe associated auxiliaryrelay, means `foreach` station# including the auxiliary relay for that station and effective only when said auxiliary relay is actuated for rendering the associated transmitting circuit eiective and to also render effective a circuit ior actuating said recall means` when said oiiice code transmitter transmits a code including the selecting elements designating the station With which said auxiliary relay is associated, and means for each auxiliary relay effective subsequent to actuation of said recall means over the circuit governed by said auxiliary relay for causing the relay to be restored to normal.

18. In a remote control system oi' the type having an oflice and a plurality of field stations, the equipment at the ofce including a code trans- Initter for transmitting different codes to said stations each comprising a rst group of elements adapted to select a station and a second group of elements for operating movable devices at the selected station and also including recall means eiiective when actuated to cause the first group of elements of a code transmitted by said code 27 transmitter to be followed by a single delivery element in place of said second group of elements, the equipment at each station including a code transmitter for transmitting indication codes to the oice for indicating the condition of said movable devices and also including starting means for initiating the operation of theV associated transmitter in response to a change in the condition of any of the movable devices at such station and also in response to said interrupted code provided the interrupted code includes the selecting elements to which such station is selectively responsive, the equipment at the oflice including means for receivingindication codes from the different eld stations, the equipment at the oice also including for each station a transmitting circuit operative when rendered eiective to cause the oirlce code transmitter to transmit a code to the corresponding station, the equipment at the office including in addition a starting relay for each station eiective when actuated-to render effective the associated transmitting circuit, each starting relay being restored to normal in consequence of transmission of a code to the corresponding station, the combination With the foregoing means of control means comprising for each station an auxiliary relay and circuitimeans controllable by the operator in one manner to actuate the associated starting relay without actuating the associated auxiliary relay and controllable in a different manner to actuate the asso-V ciated auxiliary relay, means for each station including the auxiliary relay for that station and effective only When said auxiliary relay is actuated for rendering the associated transmitting circuit effective and to also render eiective a circuit for actuating said recall means when said ofiice code transmitter transmits a code including the selecting Velements designating the station with Which said auxiliary relay is associated, and means for each auxiliary relay responsive to re'- ceipt at the office of an indication' code from the corresponding station for causing the relay to be restored to normal.

19. In a remote control system of the type having an ofce and a plurality of eld stations, the equipment at the oice including a code transmitter for transmitting different codes to said stations each comprising a first groupof elements adapted to select a station and a second group of elements for operating movable devices at the selected station and also including recall means eective when actuated to cause the :first group of elements of a code transmitted-by said code transmitter to be followed by a single delivery element in place of said second group of elements, the equipment at the office including for each station a transmitting circuit operative when rendered elective to cause the code transmitter to transmit a code to the corresponding station, the equipment at the olice also including for each station a starting relay effective when actuated to'render effective the associated transmitting circuit, each starting relay being restored to normal in consequence of transmission of a code to the corresponding station, the combination with the foregoing means of control means comprising for each station an auxiliary relay and a starting button, each starting button being manually controllable in a first or asecond manner, each starting button being operative when controlled in the first manner to actuate the associated starting relay and also controlling a circuit for actuating the starting relay for a station other than that With which the starting button is associated, each starting button When controlled in said rst manner being incapable of actuating the associated auxiliary relay, each starting button being operative when controlled in said second manner to actuate the associated auxiliary relay and being incapable of actuating the starting relay for a station other than that with which the starting button is associated, means'for each station including the auxiliary relay for that station and effective only when said auxiliary relay is actuated for rendering the associated transmitting circuit eiective and to also render effective a circuit for actuating said recall means when said oilce code transmitter transmits a code including the selecting elements designating the station with which said auxiliary relay is associated, and means for each auxiliary relay eiec- 49 tive subsequent to actuation of said recall means over the circuit governed by said auxiliary relay for restoring the relay to normal.

,FRANK T. PASCOE. l

ARTHUR L. JEROME.

REFERENCES CITED The following references are of record in the le of this patent: 

